closedquestion-8.x-3.x-dev/src/Question/Mapping/CqMappingNot.php

<?php

namespace Drupal\closedquestion\Question\Mapping;

/**
 * Class CqMappingNot.
 *
 * "NOT" implementation for mappings. Returns TRUE if it's one child returns
 * FALSE.
 *
 * @package Drupal\closedquestion\Question\Mapping
 */
class CqMappingNot extends CqAbstractMapping {

  /**
   * Implements CqAbstractMapping::evaluate()
   */
  public function evaluate() {
    if (isset($this->children[0])) {
      return (!$this->children[0]->evaluate());
    }
    return FALSE;
  }

  /**
   * Overrides CqAbstractMapping::getAllText()
   */
  public function getAllText() {
    $retval = array();
    $retval['logic']['#markup'] = 'NOT';
    $retval += parent::getAllText();
    return $retval;
  }

}